[asterisk-bugs] [JIRA] (ASTERISK-21008) falsly detecting CNG tones

[Tim Heath (JIRA)]

Tim Heath created ASTERISK-21008:
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             Summary: falsly detecting CNG tones
                 Key: ASTERISK-21008
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-21008
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
         Environment: Asterisk 1.8.18.0
Linux 2.6.18-308.11.1.el5
            Reporter: Tim Heath


Customer is experiencing an issue with SIp calls being rerouted back to the inbound DID route in the middle of some calls.
Turns out that Asterisk detects CNG tone from the sip providers side in the middle of the call and routes the call to the fax extension. (this leads back to their IVR, for what it's worth)
The customer can workaround this issue by setting "faxdetect=no" BUT they are in an argument with their SIP provider, and they would like help discovering if this is a bug within asterisk, or if there is something being sent by the provider.

I have attempted to analyze the RTP stream from an example call, and though there was some barely audible noise in the silence, I wasn't really able to make heads or tails of it. 

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